Dierdre's school has 72 sixth-graders and 54 seventh-graders. What is the ratio of sixth-graders to seventh-graders in simplest form?

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So you have fractions here I see. You have [latex] \frac{72}{54} [/latex], meaning there are 72 6th graders to 54 7th graders. Now get the greatest common factor of these numbers to simpify the fraction. [latex] \frac{72}{54}[/latex] and divide both numbers by 18, which is the gcf of 72 and 54. You will get [latex] \frac{4}{3} [/latex] Which is also equal to 1:1.25

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